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3095results about "Thermal non-catalytic cracking" patented technology

Pre-passivation process for a continuous reforming apparatus, and passivation process for a continuous reforming apparatus during the initial reacation

The present invention relates to a pre-passivation process for a continuous reforming apparatus prior to the reaction, or a passivation process for a continuous reforming apparatus during the initial reaction, comprising loading a reforming catalyst into the continuous reforming apparatus, starting the gas circulation and raising the temperature of a reactor, injecting sulfide into the gas at a reactor temperature ranging from 100-650° C., controlling the sulfur amount in the recycle gas within a range of 0.5-100×10−6 L/L so as to passivate the apparatus.
The process of the present invention may also comprise the following steps:
    • (1) loading a reforming catalyst into the continuous reforming apparatus, starting the gas circulation and raising the temperature of a reactor, feeding the reforming feedstock into the reaction system when the temperature of the reactor is increased to 300-460° C., introducing sulfide into the reaction system while or after the reforming feedstock is fed, controlling the ratio of the total sulfur amount introduced into the system to the reforming feedstock within the range of 0.5 μg/g-50 μg/g, reducing the content of sulfide introduced into the system when hydrogen sulfide concentration in the recycle gas reaches to 2.0 μL/L˜30 μL/L; and
    • (2) maintaining the reforming reactor at a temperature of 460-490° C., controlling the ratio of the total sulfur amount introduced into the system to the reforming feedstock within the range of 0.2 μg/g-0.5 μg/g, adjusting the amount of the reforming feedstock to the design value of the apparatus, increasing the reforming reaction temperature to 490-545° C. according to the requirements on the octane number of the liquid product, and letting the reforming apparatus run under normal operating conditions.
Owner:CHINA PETROCHEMICAL CORP +1

Method for gas-solid contacting in a bubbling fluidized bed reactor

The present invention relates to a method for gas-solid contacting in a bubbling fluidized bed reactor by:(a) introducing into a reactor with bed length to bed diameter ratio below about 5.0, a primary gas consisting essentially of reactant(s) of the reaction to be carried out in the bed of solid particles through a primary gas distributor located at the reactor bottom at a superficial gas velocity Up, which is very close or equivalent to the minimum fluidization velocity Umf, required for achieving the incipient fluidization of the solid particles in the bed to obtain an emulsion phase consisting essentially of the solid particles and the primary gas with little or no formation of gas bubbles to achieve incipient fluidization or liquid-like behavior of fluidizable solid particles;(b) forming gas bubbles in the incipiently fluidized bed by introducing through a secondary gas distributor located immediately above the primary gas distributor a secondary gas, selected from one of the reactants which is used in excess of that required for the reaction stoichiometry, steam, an inert or a mixture of two or more thereof at a superficial gas velocity, Us, which is related to the superficial velocity of the primary gas such that a ratio of the superficial velocity of the secondary gas to the superficial velocity of the primary gas Us / Up, is in the range from about 0.5 to about 10.0, preferably from about 1 to about 5.
Owner:COUNCIL OF SCI & IND RES
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